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Protecting Production APIs with Sub-Millisecond Rate Limiting
Implementing rate limiting in application code creates race conditions when multiple API instances handle concurrent bursts. Redis Cell, a Redis module implementing the Generic Cell Rate Algorithm (GCRA), provides atomic, sub-millisecond rate-limit checks with a single Redis command.
Documented by Saizul Amin for backend systems engineers and cloud infrastructure architects.
Written by
Md Saizul Amin
Digital Systems Strategist · AI Agent Developer · 9+ years in digital & ITMd Saizul Amin is a digital systems strategist and AI automation engineer from Dhaka, Bangladesh. With 9+ years across IT, web development and digital marketing, he writes practical guides on technology, business, education and online growth — and builds the same kinds of systems (AI agents, websites, SEO and ad campaigns) for clients in Bangladesh, the UK and the USA.
9+Years in digital & IT
50+Websites developed
7Live AI agent systems
$150K+Ad spend managed
Specialist in
AI agents & n8n automationLLM integration (Gemini, GPT-4o, Claude)Custom software & web appsWordPress developmentSEO · AEO · GEOMeta & Google AdsEmail deliverabilityCRM & funnelsIT infrastructure & cybersecurity
Credentials & experience
- 🎓B.Sc. in Computer Science & EngineeringBangladesh University of Business & Technology (BUBT), 2017–2021
- 🤖AI Automation Engineer · Web Developer · SEO SpecialistUnique Mark Limited, Birmingham UK — 2024 to present
- 🌱IT SpecialistGreen Fund Initiative Inc., USA — 2024 to present
- 🏥Junior IT Consultant — Ministry of Health (DGHS)Built the first national Shareable Health Record website; supported 6,000+ facilities
- 🧭Head of ITWEDO Bangladesh — led IT for 50+ staff, 2021–2023